Tags: phonons

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In physics, a phonon is a quasiparticle characterized by the quantization of the modes of lattice vibrations of periodic, elastic crystal structures of solids. The study of phonons is an important part of solid state physics because phonons play a major role in many of the physical properties of solids, including a material's thermal and electrical conductivities.

Learn more about quantum dots from the many resources on this site, listed below. More information on Phonons can be found here.

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  1. Limits of Thermal Processes and their Implications on Efficient Energy Utilization

    Online Presentations | 27 Oct 2010 | Contributor(s):: Arunava Majumdar

    About 90 percent of the world’s energy use involves thermal processes – thermal engines to generate mechanical power; heating and cooling in buildings; heating involved in manufacturing of steel, cement, glass, petrochemicals etc. To identify opportunities for improving current...

  2. Thermoelectric effects in semiconductor nanostructures: Role of electron and lattice properties

    Presentation Materials | 06 Oct 2010 | Contributor(s):: Abhijeet Paul, Gerhard Klimeck

    This presentation covers some aspects of present development in the field of thermoelectricity and focuses particularly on the silicon nanowires as potential thermoelectric materials. The electronic and phonon dispersions are calculated and used for the calculation of thermoelectric properties in...

  3. Tutorial 3a: Materials Simulation by First-Principles Density Functional Theory I

    Online Presentations | 14 Sep 2010 | Contributor(s):: Umesh V. Waghmare

    This lecture provides an introduction to first-principles density functional theory based methods for simulation of materials, with a focus on determination of interatomic force constants and vibrational spectra of nano-structures and extended periodic materials.Outline:Phonons, soft...

  4. DFT calculations with Quantum ESPRESSO

    Tools | 07 Jul 2010 | Contributor(s):: Janam Jhaveri, Ravi Pramod Kumar Vedula, Alejandro Strachan, Benjamin P Haley

    DFT calculations of molecules and solids

  5. Ripples and Warping of Graphene: A Theoretical Study

    Online Presentations | 19 May 2010 | Contributor(s):: Umesh V. Waghmare

    We use first-principles density functional theory based analysis to understand formation of ripples in graphene and related 2-D materials. For an infinite graphene, we show that ripples are linked with a low energy branch of phonons that exhibits quadratic dispersion at long wave-lengths. Many...

  6. CNT Mobility

    Tools | 26 Apr 2009 | Contributor(s):: Yang Zhao, Albert Liao, Eric Pop

    Simulate field effect carrier mobility in back-gated CNTFET devices at low field

  7. ECE 656 Lecture 25: Phonon Scattering III

    Online Presentations | 13 Nov 2009 | Contributor(s):: Mark Lundstrom

    Outline:ReviewPOP and IV scatteringScattering in common semiconductorsElectron-electron scatteringSummary

  8. ECE 656 Lecture 24: Phonon Scattering II

    Online Presentations | 13 Nov 2009 | Contributor(s):: Mark Lundstrom

    Outline:Review Energy-momentum conservationMathematical formulationExampleSummary

  9. ECE 656 Lecture 23: Phonon Scattering I

    Online Presentations | 10 Nov 2009 | Contributor(s):: Mark Lundstrom

    Outline:About phononsElectron-phonon couplingEnergy-momentum conservationSummary

  10. Scattering in NEGF: Made simple

    Papers | 09 Nov 2009 | Contributor(s):: Dmitri Nikonov, Himadri Pal, George Bourianoff

    Formalism for describing electron-phonon scattering, surface scattering, and spin relaxation is dervied for the Keldysh non-equilibrium Green's functions (NEGF) method. Approximation useful for efficient numerical solution are described. The specific case of the nanoMOS simulator is...

  11. Notes on Scattering and Mobility in 1D, 2D, and 3D

    Teaching Materials | 03 Nov 2009 | Contributor(s):: Dmitri Nikonov, Md. Sayed Hasan, George Bourianoff

    Derivation of the phonon-limited mobility is reviewed for electrons in bulk (3D) orquantum confined (2D and 1D) semiconductor structures. Analytical estimates are madethat show the mobility in quantum confined structures is, in general, lower or no higherthan in non-confined ones.

  12. Illinois ECE 598EP Lecture 8 - Hot Chips: Thermal Conductivity of Solids

    Online Presentations | 24 Jun 2009 | Contributor(s):: Eric Pop, Omar N Sobh

    Thermal Conductivity of SolidsTopics: Kinetic Theory of Energy Transport Simple Kinetic Theory Assumptions Phonon MFP and Scattering Time Silicon Film Thermal Conductivity Silicon Nanowire Thermal Conductivity Isotope Scattering Electron Thermal Conductivity Thermal Conductivity of Cu and Al

  13. Thermoelectric Power Factor Calculator for Superlattices

    Tools | 18 Oct 2008 | Contributor(s):: Terence Musho, Greg Walker

    Quantum Simulation of the Seebeck Coefficient and Electrical Conductivity in 1D Superlattice Structures using Non-Equilibrium Green's Functions

  14. Is dual gate device structure better from a thermal perspective?

    5.0 out of 5 stars 

    Online Presentations | 01 Sep 2008 | Contributor(s):: Dragica Vasileska, Stephen M. Goodnick

    This presentation illustrates several points. First, it is shown that in nanoscale devices there is less degradation due to heating effects due to non-stationary nature of the carrier transport (velocity overshoot) in the device, which, in turn, makes less probable the interaction with phonons....

  15. Modeling of Nanoscale Devices

    0.0 out of 5 stars 

    Papers | 19 Oct 2006 | Contributor(s):: M. P. Anantram, Mark Lundstrom, Dmitri Nikonov

    We aim to provide engineers with an introductionto the nonequilibriumGreen’s function (NEGF) approach, which is a powerful conceptual tool and a practical analysismethod to treat nanoscale electronic devices with quantum mechanicaland atomistic effects. We first review the basis for the...

  16. CDF Tools for the nanoHUB-U Course, Thermal Energy at the Nanoscale

    Groups

    This page contains up-to-date links to the CDF tools used the the subject course. Go to the wiki page for the links.

    https://nanohub.org/groups/cdf_tools_thermal_energy_course

  17. nanoHUB-U: Thermal Energy at the Nanoscale

    Courses|' 23 Jul 2013

    A free self-paced course on the essential physics of thermal energy at the nanoscale.

    https://nanohub.org/courses/TE

  18. NEMO5 distribution and support group

    Groups

    Getting NEMO 5   Access to NEMO5 source and executables is free, with restrictions. Please see the following page for commercial and academic licenses:...

    https://nanohub.org/groups/nemo5distribution

  19. Purdue ME 503: Micro-and Nano-scale Energy Transfer Processes

    Groups

    (offered Fall 2011, MWF 0830-0920 in ME 2004) This course provides a detailed treatment of the transport of energy in micro- and nano-scale structures. The physical nature of energy transport by...

    https://nanohub.org/groups/purdue_me503